CHARLOTTE, MI -- The trial of a Grand Ledge High School teacher accused of having sexual relationships with two underage students ended Friday afternoon when a judge declared a mistrial.

Eaton County Probate Judge Thomas Byerley about 5 p.m., declared a mistrial in Jason Algra's case over an evidentiary issue, according to the Eaton County Prosecutor's Office.

Algra, 32, is charged with three counts of first-degree criminal sexual conduct and five counts in the third degree. His trial began this week, and the 12-member jury deliberated for more than 10 hours, beginning Thursday.

Algra, a science teacher at Grand Ledge High School, allegedly engaged in sexual conduct with a 15-year-old male student and a 17-year-old male student. Both victims have testified against Algra, and both said he communicated with them via the Internet.